Sega CD-2 no power craziness !!!

I'm not a hardware engineer, so I cannot quite help you with this, I'm afraid. But I would do what the others above have suggested, which is generic hardware fault-finding.
If there is a short, there should be much lower resistance along the electrical path than on a good board, so maybe you can trace the traces that have this very low resistance until you find the source of the short-circuit? Starting from the main power traces to the smaller ones.

Could bad caps cause such a short, given that it is an old console?

 

thnx for your reply, I tested all caps with ESR .. found good, replaced a couple just as they were suspicious to me,

other than caps I will try to see what else can I do , most of small components were tested and found good including the few diodes available, it looks like an IC fault , cant say which though..

 

Hello
I have sega CD with the same defect as yours
I'm having the same difficulties
You found defective
Thank you

 

I've done these kind of repairs recently, and they can be a pain. A lot of issues arise from data bus problems with the 315-5632 IC. These kind of repairs require a lot of patience and probing around the board to find the bad data lines. I recently fixed a CDX with similar symptoms. I can say from experience that these problems are almost never related to the BIOS or capacitors. Basic repairs like that are usually evident from corrosion or other visually recognizable flaws.

 

thanks for your reply, I gave up after all and bought another